Medical electronic devices continue to become smaller, more precise and more power-efficient. From wearable health monitors to catheter-based sensors and implantable systems, the electronics inside these products must often acquire extremely small signals, process them accurately and operate within tight limits on size, power consumption and heat.
CMOS technology has played an important role in this evolution. The remaining design question for many medical electronics manufacturers is whether to build the signal chain from standard, off-the-shelf ICs or integrate key functions into a custom analog or mixed-signal application-specific integrated circuit (ASIC).
A custom ASIC is not automatically the best choice for every medical device. However, where size, signal performance, component availability or long-term manufacturing economics are important, it can offer advantages that are difficult to achieve with discrete components alone.
A conventional medical electronics design may use separate amplifiers, data converters, voltage references, power-management ICs and digital controllers, together with their supporting resistors and capacitors. Each part has been optimized for a broad range of customers rather than a single instrument.
An analog or mixed-signal ASIC allows the design team to combine selected functions into silicon tailored to the device’s sensors, supply voltages, accuracy targets and operating conditions. This can reduce the circuit-board area and the number of external connections while removing features that the application does not need. It can also simplify production calibration and create a more predictable component supply arrangement.
The business case does not necessarily require millions of devices per year. For a long-life medical product, the relevant calculation is cumulative production over the expected lifecycle, not annual volume alone. The right decision depends on design complexity, non-recurring engineering (NRE), manufacturing volume, the value of miniaturization and the cost of the existing electronics.
Size is one of the strongest reasons to investigate a medical ASIC. Many sensing systems must fit into housings where even a few millimeters matter. A PCB assembled from several standard ICs also requires space for routing, decoupling, protection and passive components. Integrating appropriate analog functions can reduce that footprint, although some external components will still be necessary.
Catheter-based measurements illustrate the opportunity. A miniature pressure or other physiological sensor positioned at a catheter tip may otherwise connect to its analog signal-conditioning circuit through a relatively long, thin conductor. Such a connection can be sensitive to interference, parasitic effects and signal loss, depending on the sensor and circuit architecture.
A custom ASIC can sometimes be designed with a long, narrow die geometry, rather than the more conventional near-square layout, so the signal-conditioning electronics can be positioned closer to the sensing element. Aspect ratios such as 5:1 or 10:1 may be considered where the process, die strength, packaging and assembly constraints permit. Shortening the sensitive analog path may improve the signal-to-noise performance, but the benefit must be demonstrated in the complete device design.
This design freedom can also be valuable in wearable patches, compact diagnostic instruments, hearing devices and implantable products. The ASIC dimensions are only part of the solution: interconnects, encapsulation, thermal dissipation, sterilization compatibility and assembly yield also determine the final medical-device form factor.
Medical sensor interfaces often deal with small signals and demanding accuracy requirements. Depending on the application, a custom ASIC may integrate low-noise amplifiers, programmable-gain stages, filters, multiplexers, precision references, analog-to-digital converters, temperature monitoring and calibration functions.
For example, a low-level sensor signal may require careful management of input-referred noise, offset voltage, offset drift, common-mode rejection, dynamic range and electromagnetic interference. Bringing the analog front end close to the sensing element can help control unwanted parasitics. Custom gain ranges and converter resolution can also be selected to suit the actual sensor rather than forcing the design to work around a general-purpose IC.
Power consumption is equally important, particularly in battery-operated and implantable systems. An ASIC may implement application-specific duty cycling, low-leakage standby modes and power management across analog and digital blocks. Nevertheless, lower power is not guaranteed by integration alone. Circuit topology, operating voltage, sampling rate, sensor excitation, clocking and process technology must all be optimized together.
Mixed-signal integration also introduces trade-offs. Digital switching noise can couple into sensitive analog nodes, and on-chip references and converters must meet their specifications across process, voltage and temperature variations. These are reasons to involve engineers with demonstrated analog and mixed-signal silicon experience early in the project.
The initial price of a custom chip cannot be compared directly with the price of a single standard IC. The correct comparison is between two complete solutions over the expected product lifetime.
The existing bill of materials (BOM) should include not only purchased ICs but also passive components, PCB area, assembly operations, calibration steps, test time, inventory handling and losses caused by sourcing or quality problems. An ASIC solution must account for NRE, engineering validation, photomasks, wafer fabrication, package development, production test, yield, qualification and future manufacturing support.
A simple first-pass break-even calculation divides the total one-time development cost by the estimated savings per finished device. That calculation is useful for screening, but it does not capture all lifecycle costs or the value of smaller size, lower power or improved measurement performance.
For relatively simple designs, proven analog building blocks, configurable platforms or mature manufacturing processes may help control development costs. More demanding sensor interfaces, specialized process options and unconventional packages can increase cost and schedule. There is no universal NRE figure or development timetable for a medical ASIC; both require a specification-based estimate.
Reducing the number of ICs, solder joints and interconnections can remove potential failure points. However, integration does not automatically make a medical device more reliable. The custom chip becomes a concentrated functional element, and faults in analog behavior, packaging or production screening can affect the entire product.
Analog ASIC production testing must therefore be planned during the design phase. Unlike many digital blocks, an analog circuit cannot be qualified solely by checking logical zeros and ones. Gain, offset, noise, linearity, reference accuracy, leakage, converter behavior and temperature sensitivity may require dedicated test structures, accessible measurement points or calibration methods.
The test strategy should address wafer probing, packaged-device testing, appropriate temperature coverage, acceptable limits, traceability and ongoing manufacturing monitoring. Depending on the architecture, trimming or calibration data may be stored in nonvolatile memory or implemented in the surrounding system. It is important to establish which measurements will occur during semiconductor manufacturing and which will take place during final medical-device assembly.
For this reason, an ASIC supplier’s experience in design, wafer manufacturing coordination, packaging, characterization and production test can be just as important as its circuit-design capability. These activities do not have to be performed by one company, but ownership of every interface and acceptance criterion should be clear.
Medical instruments often have long development, qualification and commercial lifecycles. Standard analog ICs can become unavailable when a manufacturer rationalizes its portfolio, changes a process or issues an end-of-life notice. A proprietary ASIC can reduce dependence on a particular catalogue component and may offer greater control over the product roadmap.
However, custom silicon is not immune to obsolescence. Foundry process availability, package materials, assembly capacity and test equipment all introduce long-term dependencies. Medical device manufacturers should agree on lifecycle support, change notification, ownership of design and test data, inventory strategy and potential migration options before committing to a supplier.
Intellectual property is another consideration. A custom chip can make functional replication more difficult than copying a circuit assembled from publicly available parts, but it is not complete protection against reverse engineering. Contracts should clearly define ownership, licensing, confidentiality and rights to continue manufacturing if a commercial relationship changes.
An ASIC intended for use in a medical product must be developed with the end device’s safety and performance requirements in mind. Relevant activities may include documented requirements, design verification, risk analysis, change control and traceability between the ASIC specification and device-level performance.
ISO 13485 provides a quality-management framework for medical device organizations, while ISO 14971 addresses medical-device risk management. Depending on the type of finished product, other standards, such as the IEC 60601 family for medical electrical equipment, may be relevant. In the United States, the FDA’s Quality Management System Regulation (QMSR) became effective on February 2, 2026, incorporating ISO 13485:2016 into the device quality-system framework.
These requirements must be interpreted according to the role of the component and the intended medical device. A semiconductor chip is not automatically a medically certified device, and selecting an ASIC vendor does not transfer the finished-product manufacturer’s regulatory responsibilities.
Selecting an ASIC partner should start with the technical specification and a realistic description of the intended product. At minimum, both parties need to understand sensor type, input signal range, noise and precision targets, sampling requirements, operating temperature, supply voltage, package limitations, safety functions, target volumes and desired production lifetime.
The supplier evaluation should look beyond a price quotation. Evidence of previous analog tape-outs, silicon characterization results, understanding of process and device mismatch, available test resources and experience managing foundry and packaging partners are important. The project agreement should also define design reviews, prototype evaluation, production yield expectations, engineering changes, IP ownership and responsibilities if a redesign is required.
A well-managed medical ASIC project is a close engineering collaboration. The device manufacturer understands the clinical use case, sensors and system-level risks; the semiconductor partner understands how those requirements translate into silicon architecture, process choice, layout, test and manufacturing. Both perspectives are needed for a successful result.
Custom analog and mixed-signal ASICs are particularly relevant where several constraints must be optimized simultaneously. Examples include catheter and pressure-sensing instruments, wearable patient monitors, ECG and other biopotential acquisition systems, optical and electrochemical diagnostics, hearing devices, portable diagnostic equipment and certain implantable electronic devices.
In each case, the benefits must be established against specific design goals. A prototype produced in low volume may be better served by standard components, while a mature product with stable requirements, stringent size or power limits and a long production horizon may justify dedicated silicon.
The original attraction of analog ASICs for medical applications remains compelling: combine the functions a device actually needs, bring the electronics closer to the sensor and design for the performance, dimensions and lifecycle of the finished product.
The strongest ASIC projects are not driven by integration for its own sake. They start with a clear system-level problem, quantify the benefit of custom silicon and treat manufacturing test, reliability and long-term supply as part of the design—not as tasks to resolve after tape-out.
For manufacturers assessing this approach, AnySilicon’s ASIC design companies directory provides a starting point for identifying semiconductor development partners. You can also use the ASIC price calculator as an early planning resource.
